Apparatus for drilling non-circular holes



K. G. WALKER. APPARATUS FOR DRILLING NON-CIRCULAR HOLES.

APPLICATION FILED SEPT. l0, IBIS.

PatentedNov. 16,1920.

INVENTOR.

R fmm ATTORNEY.

K. G. WALKER. APPARATUS FOR DRILLING NON-CIRCULAR HOLES. APPLICATION man SEPT. 1o. 191s.

1 1 Patented NOV. 16, 1920.

a sHEETs-'suzzr 2.

INVENTOR.

ATTORNEY.

K. G. WALKER. APPARATUS FOR DRILUNG NON-CIRCULAR HOLE& APPLICATION FILED SEPT. Io, 191s.

1,359-, l 29 Patented Nov. 16, 1920.

3 SHEETS-SHEET 3.

INVENTOR.

Y J. A'ITIIIINEY.

UNITED STAT KARL Gr. WALKER, 0F SEWICKLEY, PENNSYLVANIA, MENTS, T0 WILLIAM S. LAWSON,v JR., OF

Es PATENT oFFlcE- ASSIGNOR, BY MESNE ASSIGN- NEW YORK, N. Y.

APPARATUS FOR DRILLING- NON-CIRCULAR HOLES.

Application filed September 10, 1918. Serial No. 253,434.

In tools of this character the drill, which is rotated from the driving spindle is given lateral movements to properly shape vthe particular hole the apparatus is intended to produce, the lateral movements being given to the drill or boring tool by a guide. As apparatus and machines of this general character are now well known in the art I shall'not describe the' principle on which they operate, nor have I illustrated many of the features whichare common and constitute no part of my invention. t Y rIhe invention has for its object to produce a self-contained apparatus for the purpose above referred to.V l

To secure the objects of the invention the parts of the apparatus in which it is embodied are arranged and combined in a manner that will be described, in order to secure accuracy, stability and eliiciency in operation, and to reduce to a minimum wear Vupon parts, while arranging such parts as are particularly subject to wear so they may beconveniently taken out and when they become defective through breakage or wear. The pattern or guide that controls the lateral movement Vof the drilling tool and thus determines the shape of the hole produced is adjustably mounted in a support adapted to be rigidly, though adjustably, secured to a part of the machine that carries it, this support being especially constructed to support the pattern or tool guide and also to constitute a closed housing for the driving head through which the tool is rotated.

I have illustrated my invention as applied toa machine or apparatus in which there is rio-relative axial movement between the pattern and the driven spindle or drilling tool, it being contemplated, in such a machine,vthat the work shall move toward the tool, rather than the vlatter toward the work. VIt should, however, be understoodv that the invention is equally applicable to Specicaton of Letters Patent.

replaced yextremely hard metal to resist constitute the driving members Patented Nov. 16, 1920.

machines in which the 'work is held on a stationary support and the drill is moved ,axially relative thereto.

In the accompanying drawings Figure 1 is a vertical sectional -view of vapparatus embodying my invention.

Fig. 2 is an end view.

Fig. 8is an elevation, and

Fig. l is an end view of the driving head4 for the drill. Y

Figsj to 11 are detached. In the drawings, 2 indicates the driving head for the drill or boring tool, it -being provided with a shank 3, preferably tapering, and adapted to lit the rotating spindle of the drill or other Vmachine to which the apparatus is applied. The head is recessed detail views of partsl as indicated at 4, its open end being covered by a retaining plate 5 `suitably secured to thehead Aso as to be removable at will. The plate 5 has a hole k6 through it for the passage of the'drill, the hole being` of a size to permit the drill to have the necessary free lateral movements. The inner e-nd of the drill 7 has secured to it a driving piece 8, Figs. 9 and 10, formed with a tongue 9 that is adapted to lie inside the inturned shoulder or flange 10' of the driving head 2.y This driving piece isl formed with a lug 12 adapted to lie in a recess 28, Fig. 11, formed'in the shoulder 10 of the driving head. 17, Figs. 7 and 8, indivrcates a replaceable driving block seated in securely held when in working-position.

The driving block 17 should be formed of wear, and is arranged to act jdirectly against the flat face of the lug 12 of the driving piece that is secured to the end of the drill, and these 'between ,the j rotating head 2 and the tool 7. The 'end ofk the drillbears against Va wear plate' 13 located between the driving piece 8 and the inner face of the drivinghead, and free to move with the drill as it is moved lat-v erally under the action of the pattern guide that determines the shape and -size of the aperture being formed. This wear plate 'is preferably formed with a central stud-like part 14 that lies within'the central reduced portion 15 of the main recess l in the driving head. Itis also formed with an annular ridge 29 that bears against the face Yof a plate 16 formed of hard wear-resisting metal seated in the head 2 concentric with the axis thereof. In the face of the wear plate 13 toward the end ofthe drill, is preferably formed a shallow curved recess with which theend of the drill engages, permitting a slight rolling motion between the drill and this platewithout tipping the Vlatter should there be any misalinement of the parts when in use.

2O designates a support for carrying the adjustable pattern pieces 21 that constitute the guide which gives to the drill its lateral movements relative to the axis of rotation of the head'and which determines the size and shape of the aperture the drill forms. It is provided with an outwardly extending flange 22, slotted at 23 for the passage of bolts or other attaching means by which it may be secured to a suitable support, such as the framework of themachine, and to allow for angular adjustment. Thesupport is centrally recessed, in line with the opening through the drill guide, as at '23, to receive the driving head 2 and the end of the driving spindle, it thus constituting a protecting housing for these driving parts. The end of the support 20 is slotted to form parallel walls 30 between which lie the two pattern members 21 forming the drill guide, and by which these members are properly directed in their adjustments toward and from each other. Each drill guide member is formed with a screw-threaded recess 31, the Vthreads of the recesses in the two guides inclining in opposite directions when the guides are located in working position within the slotted portion of the support 20. These screw- A threaded parts of the guide members engage oppositely inclined screw-threaded parts 32 of a guide-adjusting stem 24 mounted in the support 20 so that it is free to be rotated, without, however, moving longitudinally. The stem is provided with an operating handle 33. A clamp 35 engages with a circumferentiallv recessed part of the stem 24, between the screws 32 thereof, and operates to hold the stem in Y place after it has been adjusted to properly `set the guide pieces 21. A screw 25 seated in a collar 26, operates the clamp. The form of guide for the drill ltool shown in the drawings and the means for adjusting it aretvpical, and my invention is ynot limited to these features.

A split collar 26 is appliedto the outside of the supportV 20, which isV preferably r e Vduced to receive Vthe collar. as represented 1n Fig. 1. The collar is clamped in place upon the support by the screws 27 and serves to strengthen the support and at the same time to close the open ends of the slot in which lie the members 21 constitutingv the drill guide, as clearly shown in Fig. 2. rlhe `collar thus limits the radial movements, in

Vbeing represented as adjusted to form the largest opening possible .with the guide shown in the drawings. By operating the adjusting screw stem 24 the guides may be caused to approach each other, reducing the open space between them and hence making the pattern smaller so that the drill will form a smaller hole. Adjusting screws 40, seated in the collar 26, bear respectively against the guide members 21 and prevent them from moving outwardly during use. The screws 40 are locked in position after they have been adjusted to engage with the g'uide members 21 by wing nuts 36. A gib 8 37 maybe employed. between the guideforming members 21 and the support 20 to take up wear. Screws 38 act upon this The outer ends of the guide members 21 are preferably reduced as indicated at 39, and with these parts there engages a ring 41 secured to the support 20, as represented in Figs. 1 and 2, and located partly in a recess formed therefor inthe outer end of the support and partly between the collar 26 and the saidrreduced portions of the guide members 21. Y

In assembling the parts of the apparatus the pattern or guide members 21 are inserted in the slotted portion of the support 2O and are drawn into place by means of the right and left hand screw-threaded stem 24. The collar 26 and the ring 41 are then applied Vand secured.

What I claim is:

1. In apparatus for drilling non-circular holes, a driving piece secured to the end of the drilling tool, a driving head adapted to be rotated and arranged to engage with the said driving piece to rotate the drill, a re- 110 movable wearing plate seated in the driving head, vand a wearingV piece to take the thrust of the drilling tool interposed between the latter and the wearing plate and having a concentric ridge adapted to bear posed between the latter and the wear plate 125 and having a concentric ridge adapted to bear upon such plate, the engagement between the drilling tool and the wear plate permitting a slight rolling motion between them so that slight misalinement between the tool and the driving head Will not affect the operation of the tool.

3. In apparatus for drilling non-circular holes, a recessed driving head, the opening of the recess being surrounded by an inturned shoulder in which is formed a recess, a driving piece secured to the drilling tool adapted to lie Within the recess of the driving head and formed with a laterally eX- tending lug that is to lie Within the recess in the inturned portion of the driving head, and a removable Wear-resisting driving block secured to the driving head and adapted to engage With the lug of the driving piece.

et. In apparatus for drilling non-.circular holes the combination with the drilling tool, means for rotating it and a guide for giving to the tool its lateral movements, of a slotted support for the guide and a strengthening collar surrounding the slotted portion of the support carrying the guide and secured thereto.

5. In apparatus for drilling non-circular holes, the combination With the drilling tool, means for rotating it, and an adjustable guide for giving to the tool its lateral movements, of a support for the guide having a slotted portion in which the parts of the guide are supported, means for adjust-l ing these parts to change the :form of the guide, and a collar surrounding the slotted portion of the support, in Which the tool guide is mounted, arranged to close the ends of the slot in Which the guide lies, and also serving to strengthen the slotted part of the support.

6. In apparatus for drilling vnon-circular holes, the combination With a drilling tool, means for rotating it and an adjustable guide for giving to the tool lateral movements, of a slotted support to receive the adjustable guide, means for adjusting .the parts of the guide, a strengthening collar surrounding the slotted portion of the guide, strengthening the support and closing the ends of the slot in Which the guide lies, and adjustable means for .holding the parts of the guide in place and against out- Ward movement by the tool While it is being rotated.

KARL G. WALKER. 

